Spanish中子源计划综述
An Overview of the Spallation Neutron Source Project
摘要：
Spanish中子源（SNS）由六个国家实验室的工作人员设计，建造，安装和调试，阿贡国家实验室，布鲁克海文国家实验室，杰斐逊国家加速器实验室，劳伦斯伯克利国家实验室，洛斯阿拉莫斯国家实验室和橡树岭国家实验室。加速器系统的设计提供了一个695纳秒的质子脉冲到汞靶在60赫兹的重复率和平均功率为2兆瓦。中子减速器将把散中子转化为慢中子，用于材料科学研究。前端系统被设计为产生一个H-束的微脉冲，68%的光束，32%的光束关闭每965纳秒，在2.5 MeV的1毫秒，每秒60次。前端系统包括射频驱动的批量生产离子源、束流斩波系统、前置放大器和束流传输。离子源必须达到约65 mA，才能在直线加速器的输入端提供52 mA。直线加速器由一个漂移管直线加速器高达86.8 MeV，耦合单元直线加速器185 MeV，和超导RF直线加速器的标称能量为1 GeV。超导段的设计包括11个每个低温模块具有三个0.61-β腔的低温模块和17个每个低温模块具有四个0.81-β腔的低温模块，并具有安装四个0.81-β低温模块的空间。蓄能器环设计用于在全能量下进行电荷交换注入。对于2-MW操作，在累积循环结束时每束的峰值电荷将达到2.08x10**14。目标是将光束损失控制在1x 10 **-4以下。
英文摘要：
The Spallation Neutron Source (SNS) is being designed, constructed, installed and commissioned by the staff of six national laboratories, Argonne National Laboratory, Brookhaven National Laboratory, Jefferson National Accelerator Laboratory, Lawrence Berkeley National Laboratory, Los Alamos National Laboratory, and Oak Ridge National Laboratory. The accelerator systems are designed to deliver a 695 ns proton-pulse onto a mercury target at a 60-Hz repetition rate and an average power of 2-MW. Neutron moderators that will convert the spallation neutrons into slow neutrons for material science research will surround the target. The Front-End systems are designed to generate an H- beam of minipulses, 68% beam on, 32% beam off every 965 ns, at 2.5 MeV for 1 ms, 60 times a second. The Front-End systems include a RF driven, volume-production ion source, beam chopping system, RFQ, and beam transport. The ion source will have to achieve about 65 mA to deliver 52 mA at the input to the linac. The linac consists of a drift tube linac up to 86.8 MeV, a coupled-cell linac to 185 MeV, and a superconducting RF linac to the nominal energy of 1 GeV. The design of the superconducting section includes 11 cryomodules with three, 0.61-beta cavities per cryomodule and 17 cryomodules with four, 0.81-beta cavities per cryomodule, with space to install four more 0.81-beta cryomodules. The accumulator ring is designed for charge exchange injection at full energy. The peak charge per bunch at the end of the accumulation cycle will reach 2.08x10**14 for 2-MW operation. The goal is to control beam losses to less than 1x10**-4.
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